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- W3000341370 abstract "ABSTRACT Since the Gaia data release 2, several works have been published describing a bifurcation in the observed white dwarf colour−magnitude diagram for ${G_{mathrm{BP}}}{}-{G_{mathrm{RP}}}{} gt 0$. Some possible explanations in the literature include the existence of a double population with different initial mass functions or two distinct populations, one formed by hydrogen-envelope and one formed by helium-envelope white dwarfs. We propose instead spectral evolution to explain the bifurcation. From a population synthesis approach, we find that spectral evolution occurs for effective temperatures below ${simeq }11, 000, mathrm{K}$ and masses mainly between $0.64, mathrm{M}_odot$ and $0.74, mathrm{M}_odot$, which correspond to around 16 per cent of all DA white dwarfs. We also find that the Gaia white dwarf colour–magnitude diagram indicates a star formation history that decreases abruptly for objects younger than $1.4, mathrm{Gyr}$ and a top-heavy initial mass function for the white dwarf progenitors." @default.
- W3000341370 created "2020-01-23" @default.
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- W3000341370 date "2020-02-06" @default.
- W3000341370 modified "2023-10-01" @default.
- W3000341370 title "Evidence of spectral evolution on the white dwarf sample from the <i>Gaia</i> mission" @default.
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- W3000341370 doi "https://doi.org/10.1093/mnras/staa120" @default.
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